Assigtnobs



H. STRAND ET AL 18,659

Nov. 15, 1932.

TOOL Original Filed Ogt. 19, 1925 2 Sheets-Sheet 1 7077 IZD CZG CKJWZ Beioiued Nov. 15, 1932 uulreo'smrss' PATENT mm may srmn AND anon m: xALB JAcxsorr, OFOLEVELAND, OHIO, ASSIGNORS, BY unsn'n Assm nmn'rs, 'ro AUTOMOTIVE MAINTENANCE mailman: comrAmr, or

cmcAeo, rumors, A conronArIoN or ILLINOIS v moor.

Original Io. 1,715,255, dated Kay 88, 1988 Serial No. 68,485, filed October I reissue fled December 22,

This invention relates to machines for grinding or honing the cylinders of engines, such as the cylinders of the engines of automobiles, motor vehicles or the like.

The object of the invention is to provide a machine of this character embodying a novel form of expansible grinding tool wherein the grinding or honing elements are positivel andautomatically expanded to the proper egree during the grinding operation.

Another object is to provide a simple and compact though highly organized tool of durable construction and whlch is convenient and reliable in operation and easy and comparatively. inexpensive to manufacture.

'A further object is to provide a novel form of grinding element and a novel mounting therefor whereby the grit or the like incident to the operation is collected and whereby the grinding elements are rigidly and securely thou h removably held in assembly.

Ot er objects and advantages reside in certainnovel features of the construction, ar-

rangement and combination of parts which will-be hereinafter more fully described and particularly pointed out in the appended of my invention,

claims, reference being had to the accom-; a part of this panyin'g drawings forming specification, and in' which Fig. '1 is a view in elevation showing a tool constructed in accordance with the principles Fig. 2 is a view thereof in diametrical Vertlcal section, Fig. 31s a sectional view taken on line 3-3 of Fig. 2,

Fig. 4 is-adetail perspective view of one of the holders employed for each grinding element,

one of the end'plates,

Fig. 6 is a view in elevation showing the power feed, i I

Fig; 7 is aview in horizontal section on Fig. is a detail view in elevation showing 7 line 7-7 of Fig. 6,

Fig. 8 is a detail sectional view illustrat-.

ing the slip fit-mounting for the abutment rod, and

the outer face of the end plate tions 17 mounted in the 1a, 1925. A lication in mo. Serial misoaisa.

' Fig. 9 is a fragmentaryview partly in section and partly in elevation.

Referring to the drawings and more particularly .to Figs. 1 to 5, inclusive, it will be I seen that the tool comprises anaxial shaft, 1 on which an expanding sleeve 2 is splined or otherwise slidably fitted. At the forward or.

lower end of the shaft 1 an end plate 3 is disposed and secured as bymeans of a pin 4. A similar end plate 5 for the other end of the tool is mounted on the sleeve '2. A The end ofeach rod has a head 7 receivedin a countersunk opening 8 provided therefor in the end plate 5 and the end of each rod opposite its head is threaded and coacts with a nut 8 and washer 9, the washer 9 being pressed against 3 by its nut 8 to hold the end plate 3 in position.

A plurality of holders designated generally at 10 are provided for carrying the grinding elements, the holders extending longitudinally between and being mounted on the end'plates. Each holder comprises an elongated and substantially-channel shaped body made upof a base wall 11 and side walls 12. At each end of the base wall 11 undercut end walls 13 are integrally formed and have integral inwardly extending lugs 14. Ton es 15 are integrally formed with the end walls 13 and lugs 14. I In the assembly the tongues.

15 are slidably fitted in grooves 16 formed in the confronting faces of the end plates 3 and 5 to constrain the holders to radial movements. The relative lengths ofthe tongues 15 and grooves 16 are such (see Fig.2) that the holders 10 are rigidly supported throughout their range of radial movement.

The grinding elements which are of carborundum or the like consist of a pair of. secchannel shaped body of each holder, the section of each element beingarranged in end to end relation in their holder and having their remote beveled ends 18 forced' into engagement with theundercut end walls 13 of their holder by means of a clamp ng block 19 having itsside faces undercut and engaging the adjacent beveled faces of the sections 17 under the action of a screw 21 extending through the block and threadedly engaged with the base of on the tube 2 and provided with three integral expanding arms 27, there being one arm 27 on each expander 25 for each holder 10.

The arms 27 have beveled or inclined cam surfaces 28 at their outer ends engageable with inclines 29 integrally formed with the holders 10 on their inner sides. Both inclines 29 of each holder 10 are integral with the base section of the holder on whichthey are mounted 'and one such incline 29 is also integral with a lug 14 while the'otherincline of the-same holder is integral with a cross plate 30 formed between parallel ribs 31 provided on the underside of the base section of each holder. The cross plates 30 having inwardly tapering extensions 32 slidable in grooves 33 formed in the tube 2 to aid the tongues 15 and grooves 16 in constraining the holders to radial adjustment.

Spring means is provided for holding the inclines 29 of the holders against their expandersand comprises a blade spring 35 for each holder, each spring 35 having one. end

fixed to one of the arms 27 and having its opposite end portion engaged with a cross pin 36 carried by the ribs 31. The springs 35 operate between the ribs 31.

The tool described is rotated and recipro cated by the conventional power mechanism widely employed in the art and organized with this mechanismis an automatic power feedrfor -the expanding means. As shown the shaft 1 of the tool is extended beyond the same and is coupled to the rotatable and reciprocable power drive 42. The expanding sleeve 2 is alsoextended beyond the tool. The extension of the shaft 1 is externally threaded at 40. A feed nut is threaded on the shaft portion 40 and it has a tubular connection 43 with the sleeve 2, the tubular connection or sleeve 43 being'a press fit on the sleeve 2 and loosely abutting the feed nut. A lateral pin 44 is fixed to the flange ofthe feed nut and is periodically engageable with the lower section of an extensible abutment rod (designated generally at 46) as the power member and tool are reciprocated and rotated. The rod 46 includes a tubular upper section 47 in which a lower section 48 is ad-. justably fitted. A set screw 49 holds the sections 47 and 48 in the desired adjustment. The tubular section 47 has a head 50'provided mess with a transverse slot 51 defined by parallel walls in the head. The slot 51 is somewhat elongated and slidably receives a squared portion 52a (Flg. 8) of the stationary frame 52 (Fig. 6) in such manner that the abutment rod is a slip fit on the frame, that is, the abutment rod may slide up and down but cannot swing or rotate or in other words cannot move angularly relative to the frame. By varying the length of the abutment rod the frequency of the engagement of the pin 4'4 with the rod 48 may be varied whereby the expansion of the grinding elements may be regulated to suit conditions. In considering thephaseof the operation it must be borne in mind that the entire assembly is not only rotated but moved up and down, that is reciprocated. The slip fit between the abutment rod and the frame providesthe necessary lost. motion to take care of that phase of the operation wherein the pin 44 rises directly beneath and engages the lower end of the section 48 of the rod 46. Of course, when the pin 44 strikesthe periphery of the lower section48 of the rod 46- the feed nut is held for a short interval while the rest of the assembly continues to rotate, thereby advancing the feed nut on the shaft 1 and causing the sleeve 2 through the connection 43 to advance along its shaft 1 whereby to cause the ex anders 25 carried thereby to'expand the ho ders and their grinding elements to a slight extent. The engagement of-the pin 44 and abutment rod occurs periodically and occupies only a short interval since the pin 44'slides down off the abutment rod w en the assembly partakes of the downward phase of its reciprocatory movement. In this way the requisite expansion is carried out automatically so that an efiect-ive grinding or 10; honing action may be had without manual attention to eexpansion means. i

We claim: v

1'. In combination, a grinding tool including a drive shaft, grinding elements carried 110 by the shaft adapted for radial movement with res ect to the shaft, a sleeve slidable u on the shaft, means wherebywith-longitu inal movement of the sleeve in one direction the'same will impart outward movement to the grinding elements,and means for imparting intermittent longitudinal movement to the sleeve. I

2. In a device of the character described,

a rotatable body, means for rotating the body, radially movable "grinding elements carried by the body, and means including relatively rotatable parts governed by the rotational movement of said body for intermittently imparting radial outward movement to the grinding elements.

3. In a device of the character described, a rotatable body, a plurality of radially disposed grinding elements carried by the body,

a sleeve longitudinally movable between the grinding elements, and means operable incident to slidable movement oi the sleeve in onedirection to shift the grinding members in an outward radial direction, and means for intermittently imparting slidable movement to the sleevefl i A a. In combination, a rotatable body, a plurality of radially movable abrasive'elements supported thereby, a drive shaft passing centrally through and attached to the body, a

sleeve slidable on the shaft, means for automaticallyfeeding the sleeve in a longitudinal direction, and cooperating means between the sleeve and abrasive elements for feeding them gradually in an outward direction.

5. In a grinding device, a pair ofparallel' 'end plates rigidly. connected together, abrasive carrying members supported between the plates for .radial movement, inclined members on the inner faces of the abrasive carrying members, a longitudinally movable ex- I pansion member arranged between the abrasive carrying members, means for intermittently feeding the expansion member in one direction, and bevelled expandingelements carried by the expansion member and movable over the inclined members, whereby to gradualy feed the abrasive carrying members in an outward direction incident to the movement of .the expanslon member in one direction.

6. In a device of the class described, a body,- means for rotating the body at a comparatively fast rate of speed, radially-movable grindmeans for rotating the body, radially-mow ing elements carried by the body,-and means including a non-rotative adjusting element operative by and under the control of the 'rotative movement of said body for intermit: tently imparting radial expansionmovement to the grinding elements while the grinding operation is in, progress.

7. In a device of the class described. a body,

able grinding elements carried by the body, and means including relatively rotatable elements controlled by the rotational movement of said body for automatically imparting radial expansion movement to the grinding elements. 8. In a device of the characterdescribed, a body adapted to be rotated and reciprocated,

means for transmitting saidv movements to carried by saidbody, and means including said body, radially movable grinding elements a part non-rotatable and operative under the control of the rotary motion of said motiontransmission means for automatically imparting radial outward movement to said grinding elements while said body is being reciproeated and rotated.

9. In a cylinder grinding'tool, a frame formed with radial passageways, grinding elements mounted in said'passageways for radial expansion and contraction movements, a rotatable drive member connected to said frame for rotation of thelatter during the grinding operation, means directly associated with said grinding elements for eflecting radial expansion of the same, an adjusting'me'niber associated with said drive member and normally rotatable therewith and adapted to be rotated relatively to said drive member, a connection between'said radialex pansion means and said adjusting member, and means including a non-rotatable member for utilizing the rotarymotion of said drive member to accomplish said relative rotation for operating said adjusting member to expand saidgrmding elements while the grindmg operation is in progress. i

10. In combination, a grinding tool including a drive shaft rotatable in grinding operation, grinding =elements carried by said shaft and adapted for radial movement with respect to said shaft, an adjusting member mounted upon said shaft for movement therewith and relative thereto, means whereby movement of said member in one direction relative to said shaft willimpart outward ra-- dial movement to said grinding elements, and means includinga separate non-rotative part for utilizing the rotary movement of said drive shaft for moving said member in said one direction while the in progress.

grinding operation is 11. In a grinding device, a pair of parallel end plates rigidly connected'together, abrasurfaces movable over said inclined elements,

whereby to gradually feed the abrasive carrying members in an outward direction incident to the movement-of the expansion member in one direction.

12. In a .cylinder-grinding bination of a frame-cage comprising endplate members having radial grooves in their confronting surfaces extending from the center thereof to the outer edge thereof; sidebars securely engaged with said endlates; stone-carriers arranged between sai sidebars,-each said stone-carrier having stone-receptive provision on its outer edge and at its tool, the com- I ends having projecting guide-tongues engaged directly in the grooves of the endplates, said guide-tongues being long enough radially to extend substantially throughout the length of said grooves whereby the stonecarriers are rigidly guided and supported by said end-plates throu bout. the range of re.- dial'moyement of sai stone-carriers; spring means for contracting said stone-carriers; and axially-arranged, adjustable wedgemeans arranged axially of said frame-cage and coacting with said stone-carriers to spread them radially.

13. In a cylinder-grinding tool, the com bination of a frame-cage comprising a pair of spaced end plates each having a plurality of radial grooves extending from their center to their outer edges, a plurality of spaced'connecting bars secured to and rigidly connecting said end plates, means directly connected to one of said end plates for driving said frame cage, carrier devices rigidly supporting abrasive means and mounted in said frame-cage between said connecting bars, said devices having defined end tongues which snugly and slidingly fit into said end plate grooves to provide guidance and lateral support for said carrier devices throughout their range of movement in said grooves, a support mounted axially within said frame cage, and conical devices mounted upon said support with their smaller diameter ends projected toward said drive-connected end plate, said carrier devices having surfaces shaped complementally to said conical devices and engaged by the latter to expand said carrier devices.

14. In a device of the character described, a plurality of parts normally rotatable togather which include a body, radiall movable abrasive supports carried by said ody, and means for expanding said supports including a member also rotatable relative to said body; and separate non-rotatable means engageable with said member as said rotatable parts are rotated for efiecting s'aid relative rotation between saidmember and body. N

15. Ina tool'of the class described, a body, a plurality of abrading elements supported by said body for radial expansion or contraction movement, means supported by said body and engaging said elements for eflfecting expansion thereof and for limiting contraction -movement thereofia rotatable drive member connected tosaid body for rotating the latter,

7 an adjusting member rotatable, with and relative to said drive member and connected to curely engaged at their ends with said end plates, rectangularly-snaped members mounted between said barsand having their outer longitudinal edges adapted for engagement with the surface to be treated, each said member having .at its ends projecting guide tongues engaged directly in the grooves of said end plates, said guide tongues being long enough -to extend radially substantially throughout said grooves for rigid, guided support of said members solely by said end plates throughout the range of radial movement of said members, adjustable Wedge means arranged axially of the frame-cage and .againstwhich said members are seated for radial expansionof said members, means for adjusting said wedge means, and spring means holding said members contractcd'and seated against said wedge means.

17. "In a cylinder grinder, a series of grinding stones arranged for expansion or contraction about a common axis to vary the grinding diameter of the stones, means to expand said stones toward the Work, a drive shaft for the grinder, and brake-operated means adapted to be applied during rotation of the grinder for driving said expanding means from the driveshaft of the tool.

18. A cylinder grinder comprising a h0lmeans for rotating the grinder, a driving connection between said grinder-rotating means and said expanding means, and means to put said driving connection into and out of operation.

19. In a cylinder grinding mechanism, abrading means, a member for driving said abrading means in rotary direction, and means for adjusting said abrading means toward and from the cylinder surface to be ground without removing said means from the cylinder and while the grinding operation is in progress, said latter means including a pressure element associated with said abrading means, a manually-operable and exteriorly accessible device associated with. said drive member and rotatable therewith and relative thereto, and a connection between said pressure element and said device.

20. In a cylinder grinding mechanism, abrading elements, a support for said elements, drive means for imparting motion to said support, a drive connection between said drive means and said support, and means for adjusting said elements toward and from the surface to be ground including an adjusting device associated with said drive and arranged for rotary movement therewith and relative thereto, a connection between said device and said elements, and a friction-member associated with said device and adapted to frictionally engage the latter to retard or stop its rotary. movement to eifect relative rotary movement between said device and v freely throu ing said elements from the cylinder being ground.

a hollow mandrel, radially expansible abrading members mounted thereon, a davice in the mandrel to expand said members, a drivin shaft operatively connected to the mandre and means to drive said ex anding device from the shaft, said means eriving its motion from the driving shaft of the mandrel.

22. In a device of the class described, a rotatable frame having spaced end plates, a

drive shaft passing centrally through said frame and connected to the bottom end plate, abrasive carriers supported by said end plates, and means for expanding and contracting said carriers including a sleeve surrounding said drive shaft, adjusting elements supported b said sleeve and engaging said carriers, an means for moving said sleeve relative to said drive shaft to move-said elements axiall to expand said carriers 23. In a evice of the class described, a rotatable frame having spaced and plates with ooves therein, a drive shaft passin centra 1y throu h one of said end plates an drive connector? to the other of said plates, abrasive carriers having end portions supported in thegrooves of said end plates, and

'means for ex anding and contracting said carriers inclu ing a sleeve surrounding said 85 drive shaft, adjusting elements'supported by said sleeve and engagin said carrier, and

means for adjustin said s eeve to move said.

elementsv axially 0 said carriers. r

24. In a tool of the class described, a rotatablelframe, a plurality of expansible and consaid frame 7, to expand tractible abrasive elements mounted in said frame, a drive shaft passin centrally through said frame and having me connection therewith, asleeve surrounding said a grinding tool, the combination of .the later, means for 'adjustin means to vary the position 0 said carrier passageways, and spring f devices,-and means for moving said sleeve relative to said drive shaft to move said devices axially of said frame to expand said carriers.

26. In a tool of the class described, the combination of a frame-cage having and lates with aligned rooves in their conronting faces exten ing from their outer edges inwardly a substantial distance, spaced bar members supporting said plates in spaced relation, carrier members mounted between said'bar members and supporting wall-engaging elements, said carriermembers hav mg end portions g-uidingly su ported in said grooves, adjustable owe ge means mounted axially of said frame-cage and coacting with said carrier members to spread them radially, means for adjusting said wedge means. and s ring means for contracting' and holding sald carrier members in engagementivith said wedge means. 27 In a device of the class described, the combination of a frame-cage having end plates with aligned ooves in their confrontmg faces, a plurallty of circumferentiall spaced osts having their ends enga ed with said en lates for supporting the atter in spaced re ation and definin" radial p'assageways, wall-engaging mem ,ers mounted in said passa eways and having their ends slidably seate in said girooves for sole guidance an support of sai members in expansion and contraction m vements, ad ustable wedge means disposed axially of said cageframe in engagement with said'carrier members for limiting the extent of contraction of said "wedge members in said means holdin' sai carrier members In en'- gag'ement wit said'wed e means.

HENRY STRA D. BYRON DE KALB JACKSON.

shaft within said frame, ad'usting elements 7 carried by said sleeve and tive enga to expan ments'a're moved axiall of the frame, and means for moving said eeve relative-to said drive shaft to effect axial movement of'said adjusting elements. 1 t

t 25. Ina tool'ofthe class described, a rotat- 55 able frame having top and bottom end plates aced apart by post members defining ra a1 passageways, abrasive carriers mounted in said passa eways, a drive shaft passing said to end plate, centrally on through sai frame an rigid y connected to said bottom end plate, carrier expanding devi0es having inchned surfaces enga ing comi plementa'lly-shaped surfaces on sai carriers, a sleeve surrounding said drive shaft within aving cooperament with said abrasive elements 08 said frame and supporting said expanding the latter as said adjusting ele:

I no 

